Instep: 75% calfskin leather and 25% textil. Inner lining: 75% textile and 25% pig skin – leather. Sole: 100% synthetic. Removable insole. Type of close: Laces. Heel height/Sole 3.5 cm (1.38''). Extra Comfort. Light: Extra-light sole that reduces weight and facilitates propulsion while walking.. Memory Foam: Removable insole with maximum comfort in the arch and heel, thanks to its extra-cushioned technology.. Coolmax: Polyester fiber that enhances breathability.